1 // environment.hxx -- routines to model the natural environment.
3 // Written by David Megginson, started February 2002.
5 // Copyright (C) 2002 David Megginson - david@megginson.com
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #ifndef _ENVIRONMENT_HXX
25 #define _ENVIRONMENT_HXX
27 #include <simgear/compiler.h>
31 #include <Main/fgfs.hxx>
33 #ifdef SG_HAVE_STD_INCLUDES
41 * Model the natural environment.
43 * This class models the natural environment at a specific place and
44 * time. A separate instance is necessary for each location or time.
46 * This class should eventually move to SimGear.
48 class FGEnvironment : public FGSubsystem
54 virtual ~FGEnvironment();
58 virtual void unbind ();
59 virtual void update (int dt);
61 inline virtual double get_visibility_m () const { return visibility_m; }
62 inline virtual double get_wind_from_heading_deg () const {
63 return wind_from_heading_deg;
65 inline virtual double get_wind_speed_kt () const { return wind_speed_kt; }
66 inline virtual double get_wind_from_north_fps () const {
67 return wind_from_north_fps;
69 inline virtual double get_wind_from_east_fps () const {
70 return wind_from_east_fps;
72 inline virtual double get_wind_from_down_fps () const {
73 return wind_from_down_fps;
76 virtual void set_visibility_m (double v);
77 virtual void set_wind_from_heading_deg (double h);
78 virtual void set_wind_speed_kt (double s);
79 virtual void set_wind_from_north_fps (double n);
80 virtual void set_wind_from_east_fps (double e);
81 virtual void set_wind_from_down_fps (double d);
85 void _recalc_hdgspd ();
90 double wind_from_heading_deg;
93 double wind_from_north_fps;
94 double wind_from_east_fps;
95 double wind_from_down_fps;
97 // Do these belong here?
98 GLfloat fog_exp_density;
99 GLfloat fog_exp2_density;
103 // FIXME: move to FGGlobals.
104 extern FGEnvironment current_environment;
106 #endif // _ENVIRONMENT_HXX